ECE R41.04 supplement 04

ECE R41.04 supplement 04 Noise emissions of motorcycles

final
https://www.unece.org/fileadmin/DAM/trans/main/wp29/wp29regs/2016/R041r2am4e.pdf

Draft
https://www.unece.org/fileadmin/DAM/trans/doc/2016/wp29/ECE-TRANS-WP29-2016-003e.pdf